Onni Helen is a professional footballer from FIN and is currently 21 years old. He is on the books of Sogndal and wears shirt number 15. His main role on the pitch is Forward. He measures 186cm in height and weighs 76kg. His stronger foot is Right. His estimated market valuation currently stands at 200K €.

His latest transfer saw him join Sogndal from TPS Turku via on 2025-12-31.

During the UEFA European U21 Championship qualification 2025-2027 campaign, Onni Helen made 3 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.